ORCID Profile
0000-0003-2003-9992
Current Organisation
University of Sydney
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Research Topics
In Research Link Australia (RLA), "Research Topics" refer to ANZSRC FOR and SEO codes. These topics are either sourced from ANZSRC FOR and SEO codes listed in researchers' related grants or generated by a large language model (LLM) based on their publications.
Top 5 Research Topics
ANZSRC Field of Research (FoR)
Theory Of Materials | Condensed Matter Physics—Structural Properties | Time-Series Analysis | Structural Chemistry | Condensed Matter Physics | Macromolecular and Materials Chemistry | Colloid And Surface Chemistry | Computation Theory and Mathematics | Physical Chemistry (Incl. Structural) | Computer Communications Networks | Composite Materials | Theory and Design of Materials | Instruments And Techniques | Logics And Meanings Of Programs | Information Storage, Retrieval And Management | Biological Sciences Not Elsewhere Classified | Other Physical Sciences | Computer Hardware | Materials Engineering | Petroleum And Reservoir Engineering | Computer Hardware Not Elsewhere Classified | Soft Condensed Matter | Thermodynamics And Statistical Physics | Physical Sciences Not Elsewhere Classified
ANZSRC Socio-Economic Objective (SEO)
Physical sciences | Mathematical sciences | Chemical sciences | Oil and gas | Data, image and text equipment | Other | Scientific instrumentation | Communication services not elsewhere classified | Expanding Knowledge in the Chemical Sciences | Expanding Knowledge in the Physical Sciences | Reconstituted products (e.g. chipboard, particle board) | Treatments (e.g. chemicals, antibiotics) | Computer hardware and electronic equipment not elsewhere classified |
Related Links
Publications
Understanding Competition states
Publisher: Informa UK Limited
Date: 2010
Small-angle X-ray scattering from ternary microemulsions determines microstructure
Publisher: American Chemical Society (ACS)
Date: 04-1988
DOI: 10.1021/J100319A038
2D hyperbolic groups induce three-periodic Euclidean reticulations
Publisher: Springer Science and Business Media LLC
Date: 06-2004
Additive-induced morphological tuning of self-assembled silica–barium carbonate crystal aggregates
Publisher: Elsevier BV
Date: 04-2009
Random connected cylinders: A new structure in three-component microemulsions
Publisher: IOP Publishing
Date: 09-1987
Differential geometry of crystal structure descriptions, relationships and phase transformation
Publisher: Walter de Gruyter GmbH
Date: 1985
Nanocompartmentalization of Soft Materials with Three Mutually Immiscible Solvents: Synthesis and Self-Assembly of Three-Arm Star-Polyphiles
Publisher: American Chemical Society (ACS)
Date: 23-01-2015
DOI: 10.1021/CM503981T
The rise and fall of the magic kingdom: understanding Kevin Rudd's domestic statecraft
Publisher: ANU Press
Date: 12-2010
DOI: 10.22459/RG.12.2010
Evidence-based policy making and social science
Publisher: Bristol University Press
Date: 2016
Parting Shots
Publisher: Informa UK Limited
Date: 06-2009
Surface embeddings of the Klein and the Möbius–Kantor graphs
Publisher: International Union of Crystallography (IUCr)
Date: 27-03-2018
DOI: 10.1107/S2053273318002036
Abstract: This paper describes an invariant representation for finite graphs embedded on orientable tori of arbitrary genus, with working ex les of embeddings of the Möbius–Kantor graph on the torus, the genus-2 bitorus and the genus-3 tritorus, as well as the two-dimensional, 7-valent Klein graph on the tritorus (and its dual: the 3-valent Klein graph). The genus-2 and -3 embeddings describe quotient graphs of 2- and 3-periodic reticulations of hyperbolic surfaces. This invariant is used to identify infinite nets related to the Möbius–Kantor and 7-valent Klein graphs.
Comment on discovery of a tetracontinuous, aqueous lyotropic network phase with unusual 3D-hexagonal symmetry by M. Mahanthappa, G. Sorenson and A. Schmitt
Publisher: Royal Society of Chemistry (RSC)
Date: 2015
DOI: 10.1039/C4SM01932F
Abstract: The structure of the P 6 3 /mcm phase in gemini surfactants is the tri-continuous 3etc(193) geometry, and this represents a nearly stable morphology also in diblock copolymer melts.
Policy Transfer in Critical Perspective
Publisher: Informa UK Limited
Date: 06-2009
Political participation in Australia: contingency in the behaviour and attitudes of citizens
Publisher: Informa UK Limited
Date: 07-02-2016
Cubic membranes: a structure-based design for DNA uptake
Publisher: The Royal Society
Date: 12-02-2008
Abstract: Cubic membranes are soft three-dimensional crystals found within cell organelles in a variety of living systems, despite the aphorism of Fedorov: ‘crystallization is death’. They consist of multi-bilayer lipid–protein stacks, folded onto anticlastic surfaces that resemble triply periodic minimal surfaces, forming highly swollen crystalline sponges. Although cubic membranes have been observed in numerous cell types and under different pathophysiological conditions, knowledge about the formation and potential function(s) of non-lamellar, cubic structures in biological systems is scarce. We report that mitochondria with this cubic membrane organization isolated from starved amoeba Chaos carolinense interact sufficiently with short segments of phosphorothioate oligonucleotides (PS-ODNs) to give significant ODNs uptake. ODNs condensed within the convoluted channels of cubic membrane by an unknown passive targeting mechanism. Moreover, the interaction between ODNs and cubic membrane is sufficient to retard electrophoretic mobility of the ODN component in the gel matrix. These ODN–cubic membrane complexes are readily internalized within the cytoplasm of cultured mammalian cells. Transmission electron microscopic analysis confirms ODNs uptake by cubic membranes and internalization of ODN–cubic membrane complexes into the culture cells. Cubic membranes thus may offer a new, potentially benign medium for gene transfection.
Structural directing roles of isomeric phenylenediacetate ligands in the formation of coordination networks based on flexible N,N′-di(3-pyridyl)suberoamide
Publisher: Royal Society of Chemistry (RSC)
Date: 2015
DOI: 10.1039/C4CE01752H
Abstract: A 5-fold cds net and 1D network with a new mode of entanglement were formed from N , N ′-di(3-pyridyl)suberoamide with Cu( ii ) salts.
Contemporary Geometry For The Built Design?
Publisher: Informa UK Limited
Date: 08-2010
The density of silicon‐rich zeolite frameworks
Publisher: International Union of Crystallography (IUCr)
Date: 05-1993
EDITORIAL: New directions in the study of policy transfer
Publisher: Informa UK Limited
Date: 06-2009
Tiling patterns from ABC star molecules: 3-colored foams?
Publisher: Royal Society of Chemistry (RSC)
Date: 2014
DOI: 10.1039/C4SM01052C
Abstract: Based on coarse-grained simulations and Surface Evolver calculations we explore if the formation of tiling patterns formed by ABC star molecules can be considered 3-colored foams.
The disordered open connected model of microemulsions
Publisher: Steinkopff
DOI: 10.1007/BFB0114175
Unconventional magnetism in all-carbon nanofoam
Publisher: American Physical Society (APS)
Date: 17-08-2004
Complex networks on hyperbolic surfaces
Publisher: Elsevier BV
Date: 02-2005
Ab-initio construction of some crystalline 3D Euclidean networks
Publisher: Elsevier BV
Date: 2003
D’Arcy Thompson’s Legacy in Contemporary Studies of Patterns and Morphology
Publisher: Informa UK Limited
Date: 03-2013
Elastic warping of graphitic carbon sheets: relative energies of some fullerenes, schwarzites and buckytubes
Publisher: The Royal Society
Date: 16-09-1996
How the west was won?
Publisher: Informa UK Limited
Date: 2010
Interfacial architecture in surfactant-water mixtures: Beyond spheres, cylinders and planes
Publisher: Walter de Gruyter GmbH
Date: 1992
A note on the two symmetry-preserving covering maps of the gyroid minimal surface
Publisher: Springer Science and Business Media LLC
Date: 11-2005
Cameron's competition state
Publisher: Palgrave Macmillan UK
Date: 2009
Understanding policy transfer in the competition state
Publisher: Edward Elgar Publishing
Date: 31-08-2010
From untangled graphs and nets to tangled materials
Publisher: Elsevier BV
Date: 04-2011
Structural analysis of a carbon foam formed by high pulse-rate laser ablation
Publisher: Springer Science and Business Media LLC
Date: 12-1999
Self-Assembly of Linear Block Copolymers. Relative Stability of Hyperbolic Phases
Publisher: American Chemical Society (ACS)
Date: 12-1993
DOI: 10.1021/MA00077A014
Polyhedra and packings from hyperbolic honeycombs
Publisher: Proceedings of the National Academy of Sciences
Date: 20-06-2018
Abstract: The simplest 2D regular honeycombs are familiar patterns, found in an extraordinary range of natural and designed systems. They include tessellations of the plane by squares, hexagons, and equilateral triangles. Regular triangular honeycombs also form on the sphere they are the triangular Platonic polyhedra: the tetrahedron, octahedron, and icosahedron. Regular hyperbolic honeycombs adopt an infinite variety of topologies these must be distorted to be situated in 3D space and are thus frustrated. We construct minimally frustrated realizations of the simplest hyperbolic honeycombs.
Understanding localism, Part 2
Publisher: Informa UK Limited
Date: 11-2013
Polycontinuous geometries for inverse lipid phases with more than two aqueous network domains
Publisher: Royal Society of Chemistry (RSC)
Date: 2013
DOI: 10.1039/C2FD20112G
Abstract: Inverse bicontinuous cubic phases with two aqueous network domains separated by a smooth bilayer are firmly established as equilibrium phases in lipid/water systems. The purpose of this article is to highlight the generalisations of these bicontinuous geometries to polycontinuous geometries, which could be realised as lipid mesophases with three or more network-like aqueous domains separated by a branched bilayer. An analysis of structural homogeneity in terms of bilayer width variations reveals that ordered polycontinuous geometries are likely candidates for lipid mesophase structures, with similar chain packing characteristics to the inverse micellar phases (that once were believed not to exist due to high packing frustration). The average molecular shape required by global geometry to form these multi-network phases is quantified by the surfactant shape parameter, v/(al) we find that it adopts values close to those of the known lipid phases. We specifically analyse the 3etc(187 193) structure of hexagonal symmetry P6(3) /mcm with three aqueous domains, the 3dia(24 220) structure of cubic symmetry I43d composed of three distorted diamond networks, the cubic chiral 4srs(24 208) with cubic symmetry P4232 and the achiral 4srs(5 133) structure of symmetry P42/nbc, each consisting of four intergrown undistorted copies of the srs net (the same net as in the QII(G) gyroid phase). Structural homogeneity is analysed by a medial surface approach assuming that the headgroup interfaces are constant mean curvature surfaces. To facilitate future experimental identification, we provide simulated SAXS scattering patterns that, for the 4srs(24 208) and 3dia(24 220) structures, bear remarkable similarity to those of bicontinuous QII(G)-gyroid and QII(D)-diamond phases, with comparable lattice parameters and only a single peak that cannot be indexed to the well-established structures. While polycontinuous lipid phases have, to date, not been reported, the likelihood of their formation is further indicated by the reported observation of a solid tricontinuous mesoporous silicate structure, termed IBN-9, which formed in the presence of surfactants [Han et al., Nat. Chem., 2009, 1, 123].
Topological transformations mediated by bilayer punctures: from sponge phases to bicontinuous monolayers and reversed sponges
Publisher: Elsevier BV
Date: 11-1997
Nets with collisions (unstable nets) and crystal chemistry
Publisher: International Union of Crystallography (IUCr)
Date: 12-09-2013
DOI: 10.1107/S0108767313020655
Abstract: Nets in which different vertices have identical barycentric coordinates ( i.e. have collisions) are called unstable. Some such nets have automorphisms that do not correspond to crystallographic symmetries and are called non-crystallographic. Ex les are given of nets taken from real crystal structures which have embeddings with crystallographic symmetry in which colliding nodes either are, or are not, topological neighbors (linked) and in which some links coincide. An ex le is also given of a crystallographic net of exceptional girth (16), which has collisions in barycentric coordinates but which also has embeddings without collisions with the same symmetry. In this last case the collisions are termed unforced .
Positive magnetisation in carbon nanostructures
Publisher: Elsevier BV
Date: 06-2006
Towards enumeration of crystalline frameworks: the 2D hyperbolic approach
Publisher: Elsevier BV
Date: 07-2006
Crystals: animal, vegetable or mineral?
Publisher: The Royal Society
Date: 06-08-2015
Abstract: The morphologies of biological materials, from body shapes to membranes within cells, are typically curvaceous and flexible, in contrast to the angular, facetted shapes of inorganic matter. An alternative dichotomy has it that biomolecules typically assemble into aperiodic structures in vivo , in contrast to inorganic crystals. This paper explores the evolution of our understanding of structures across the spectrum of materials, from living to inanimate, driven by those naive beliefs, with particular focus on the development of crystallography in materials science and biology. The idea that there is a clear distinction between these two classes of matter has waxed and waned in popularity through past centuries. Our current understanding, driven largely by detailed exploration of biomolecular structures at the sub-cellular level initiated by Bernal and Astbury in the 1930s, and more recent explorations of sterile soft matter, makes it clear that this is a false dichotomy. For ex le, liquid crystals and other soft materials are common to both living and inanimate materials. The older picture of disjoint universes of forms is better understood as a continuum of forms, with significant overlap and common features unifying biological and inorganic matter. In addition to the philosophical relevance of this perspective, there are important ramifications for science. For ex le, the debates surrounding extra-terrestrial life, the oldest terrestrial fossils and consequent dating of the emergence of life on the Earth rests to some degree on prejudices inferred from the supposed dichotomy between life-forms and the rest.
Co-design with citizens and stakeholders
Publisher: Policy Press
Date: 29-09-2016
DOI: 10.1332/POLICYPRESS/9781447329367.003.0014
Abstract: This chapter examines how design thinking, with its commitment to seeing challenges from the user perspective, prototyping and rapid learning, has begun to make head way in the policy world as a technique to review service delivery practices. This chapter will review the thinking behind it, connecting design to various social sciences theories and showing applications of the technique.
Morphogenesis of Self-Assembled Nanocrystalline Materials of Barium Carbonate and Silica
Publisher: American Association for the Advancement of Science (AAAS)
Date: 16-01-2009
Abstract: The precipitation of barium or strontium carbonates in alkaline silica-rich environments leads to crystalline aggregates that have been named silica/carbonate biomorphs because their morphology resembles that of primitive organisms. These aggregates are self-assembled materials of purely inorganic origin, with an amorphous phase of silica intimately intertwined with a carbonate nanocrystalline phase. We propose a mechanism that explains all the morphologies described for biomorphs. Chemically coupled coprecipitation of carbonate and silica leads to fibrillation of the growing front and to laminar structures that experience curling at their growing rim. These curls propagate in a surflike way along the rim of the laminae. We show that all observed morphologies with smoothly varying positive or negative Gaussian curvatures can be explained by the combined growth of counterpropagating curls and growing laminae.
Meditation on an Engraving of Fricke and Klein (The Modular Group and Geometrical Chemistry)
Publisher: CSIRO Publishing
Date: 2003
DOI: 10.1071/CH03191
Abstract: A non-technical account of the links between two-dimensional (2D) hyperbolic and three-dimensional (3D) euclidean symmetric patterns is presented, with a number of ex les from both spaces. A simple working hypothesis is used throughout the survey: simple, highly symmetric patterns traced in hyperbolic space lead to chemically relevant structures in euclidean space. The prime ex les in the former space are derived from Felix Klein's engraving of the modular group structure within the hyperbolic plane these include various tilings, networks and trees. Disc packings are also derived. The euclidean ex les are relevant to condensed atomic and molecular materials in solid-state chemistry and soft-matter structural science. They include extended nets of relevance to covalent frameworks, simple (lattice) sphere packings, and interpenetrating extended frameworks (related to novel coordination polymers). Limited discussion of the projection process from 2D hyperbolic to 3D euclidean space via mapping onto triply periodic minimal surfaces is presented.
Some equivalent two-dimensional weavings at the molecular scale in 2D and 3D metal–organic frameworks
Publisher: Royal Society of Chemistry (RSC)
Date: 2016
DOI: 10.1039/C6CE01463A
Conclusion: Connecting social science and policy
Publisher: Policy Press
Date: 29-09-2016
DOI: 10.1332/POLICYPRESS/9781447329367.003.0015
Abstract: The conclusion makes an argument for how the relationship between policy and social science could be improved.
All toroidal embeddings of polyhedral graphs in 3-space are chiral
Publisher: Royal Society of Chemistry (RSC)
Date: 2009
DOI: 10.1039/B907338H
Polar–Nonpolar Interfaces of Inverse Bicontinuous Cubic Phases in Phytantriol/Water System are Parallel to Triply Periodic Minimal Surfaces
Publisher: American Chemical Society (ACS)
Date: 14-11-2018
DOI: 10.1021/ACS.LANGMUIR.8B03320
Abstract: We investigated two distinct lyotropic liquid crystal inverse bicontinuous cubic phases of phytantriol/water mixtures by small-angle X-ray crystallography of the single-crystal regions. Reconstructed electron density maps revealed hydrophilic head and hydrophobic tail regions of the phytantriol bilayer membranes and water regions. The bilayer membranes are shown to be located on the D and gyroid triply periodic minimal surfaces. To investigate the structures of the polar-nonpolar interfaces, we optimized two models: a parallel surface model and a constant mean curvature surface model. The parallel surface model agreed well with the X-ray data, and the R factors, which show the degree of agreement between those structural models and the data, were less than 0.04. In stark contrast, the constant mean curvature surface model deviated significantly from the data, and the R factors were around 0.15. We therefore conclude that the polar-nonpolar interface of the inverse bicontinuous cubic phase of the phytantriol/water system is close to a parallel surface to a triply periodic minimal surface.
Mapping hyperbolic order in curved materials
Publisher: Royal Society of Chemistry (RSC)
Date: 2023
DOI: 10.1039/D2SM01403C
Abstract: We present a new method for visualisation and analysis of patterns on triply periodic negatively curved surfaces by mapping to two-dimensional hyperbolic space.
Hyperbolic Surfaces in the Solid State and the Structure of ZSM-5 Zeolites.
Publisher: Danish Chemical Society
Date: 1991
The density of three-dimensional nets
Publisher: International Union of Crystallography (IUCr)
Date: 11-1994
Emergence and function of complex form in self-assembly and biological cells
Publisher: The Royal Society
Date: 16-06-2017
A thousand-genome panel retraces the global spread and climatic adaptation of a major crop pathogen
Publisher: Cold Spring Harbor Laboratory
Date: 27-08-2022
DOI: 10.1101/2022.08.26.505378
Abstract: Human activity impacts the evolutionary trajectories of many species worldwide. Global trade of agricultural goods contributes to the dispersal of pathogens reshaping their genetic makeup and providing opportunities for virulence gains. Understanding how pathogens surmount control strategies and cope with new climates is crucial to predicting the future impact of crop pathogens. Here, we address this by assembling a global thousand-genome panel of Zymoseptoria tritici , a major fungal pathogen of wheat reported in all production areas worldwide. We identify the global invasion routes and ongoing genetic exchange of the pathogen among wheat-growing regions. We find that the global expansion was accompanied by increased activity of transposable elements and weakened genomic defenses. Finally, we find significant standing variation for adaptation to new climates encountered during the global spread. Our work shows how large population genomic panels enable deep insights into the evolutionary trajectory of a major crop pathogen.
Entanglement of Embedded Graphs
Publisher: Oxford University Press (OUP)
Date: 2011
DOI: 10.1143/PTPS.191.235
From Monolayers to Bilayers: Mesostructural Evolution in DDAB/Water/Tetradecane Microemulsions
Publisher: American Chemical Society (ACS)
Date: 15-06-2004
DOI: 10.1021/JP037961V
A thousand-genome panel retraces the global spread and adaptation of a major fungal crop pathogen
Publisher: Springer Science and Business Media LLC
Date: 24-02-2023
DOI: 10.1038/S41467-023-36674-Y
Abstract: Human activity impacts the evolutionary trajectories of many species worldwide. Global trade of agricultural goods contributes to the dispersal of pathogens reshaping their genetic makeup and providing opportunities for virulence gains. Understanding how pathogens surmount control strategies and cope with new climates is crucial to predicting the future impact of crop pathogens. Here, we address this by assembling a global thousand-genome panel of Zymoseptoria tritici , a major fungal pathogen of wheat reported in all production areas worldwide. We identify the global invasion routes and ongoing genetic exchange of the pathogen among wheat-growing regions. We find that the global expansion was accompanied by increased activity of transposable elements and weakened genomic defenses. Finally, we find significant standing variation for adaptation to new climates encountered during the global spread. Our work shows how large population genomic panels enable deep insights into the evolutionary trajectory of a major crop pathogen.
Trading spaces: Building three-dimensional nets from two-dimensional tilings
Publisher: The Royal Society
Date: 25-01-2012
Abstract: We construct some ex les of finite and infinite crystalline three-dimensional nets derived from symmetric reticulations of homogeneous two-dimensional spaces: elliptic ( S 2 ), Euclidean ( E 2 ) and hyperbolic ( H 2 ) space. Those reticulations are edges and vertices of simple spherical, planar and hyperbolic tilings. We show that various projections of the simplest symmetric tilings of those spaces into three-dimensional Euclidean space lead to topologically and geometrically complex patterns, including multiple interwoven nets and tangled nets that are otherwise difficult to generate ab initio in three dimensions.
Tricontinuous mesophases of balanced three-arm ‘star polyphiles’
Publisher: Royal Society of Chemistry (RSC)
Date: 2009
DOI: 10.1039/B822814K
The Democracy-Politics paradox: The dynamics of political alienation
Publisher: Berghahn Books
Date: 2014
Complacent young citizens or cross-generational solidarity? An analysis of Australian attitudes to democratic politics
Publisher: Informa UK Limited
Date: 20-03-2017
Disordered lamellar structure in the isotropic phase of a ternary double-chain surfactant system
Publisher: EDP Sciences
Date: 1990
Minimal nets and minimal minimal surfaces
Publisher: International Union of Crystallography (IUCr)
Date: 26-07-2013
In conclusion: localism in the present and the future
Publisher: Informa UK Limited
Date: 11-2013
Policy transfer: Coming of age and learning from the experience
Publisher: Informa UK Limited
Date: 11-2012
Policy transfer: Into the future, learning from the past
Publisher: Informa UK Limited
Date: 11-2012
The intrinsic curvature of solids
Publisher: Walter de Gruyter GmbH
Date: 1984
Hierarchical self-assembly of a striped gyroid formed by threaded chiral mesoscale networks
Publisher: Proceedings of the National Academy of Sciences
Date: 13-01-2014
Abstract: Chirality and hierarchical ordering are two fundamental properties found in many of nature’s most complex self-assembled structures such as living cells. Simultaneous control over these properties in synthetic systems is vital to mimic or even surpass nature’s designs. Via numerical simulations, we describe a class of complex morphologies that afford radically new architectures for self-assembled shapes. Specifically, a mixture of two star block-copolymers are shown to form multiple interwoven 2D and 3D labyrinths—all chiral—and hierarchically ordered on two different length scales. Furthermore, we show that such intricate network morphologies forming at a confined, hyperbolic interface can be classified and modeled in terms of a much simpler isotropic model of packing based on tilings of the hyperbolic plane.
Optimal packings of three-arm star polyphiles: from tricontinuous to quasi-uniformly striped bicontinuous forms
Publisher: The Royal Society
Date: 16-06-2017
Abstract: Star-shaped molecules with three mutually immiscible arms self-assemble to form a variety of novel structures, with conformations that attempt to minimize interfacial area between the domains composed of the different arms. The geometric frustration caused by the joining of these arms at a common centre limits the size and shape of each domain, encouraging the creation of complex and interesting solutions. Some solutions are tricontinuous, and these solutions (and others) share aspects of bicontinuous structures with hiphilic assemblies as similar molecular segregation factors are at work. We describe both highly symmetric and balanced structures, as well as unbalanced solutions that take the form of intricately striped hiphilic membranes. All these patterns can result in chiral assemblies with multiple networks.
The localism gap - the CLEAR failings of official consultation in the Murray Darling Basin
Publisher: Informa UK Limited
Date: 11-2013
Policy transfer in a competition state
Publisher: Routledge
Date: 05-07-2004
Specific Heat Is a Useful Indicator of Microstructural Variation in Surfactant Solutions
Publisher: American Chemical Society (ACS)
Date: 11-1989
DOI: 10.1021/LA00090A031
Hyperbolic crystallography of two-periodic surfaces and associated structures
Publisher: International Union of Crystallography (IUCr)
Date: 07-02-2017
DOI: 10.1107/S2053273316019112
Abstract: This paper describes the families of the simplest, two-periodic constant mean curvature surfaces, the genus-two HCB and SQL surfaces, and their isometries. All the discrete groups that contain the translations of the genus-two surfaces embedded in Euclidean three-space modulo the translation lattice are derived and enumerated. Using this information, the subgroup lattice graphs are constructed, which contain all of the group–subgroup relations of the aforementioned quotient groups. The resulting groups represent the two-dimensional representations of subperiodic layer groups with square and hexagonal supergroups, allowing exhaustive enumeration of tilings and associated patterns on these surfaces. Two ex les are given: a two-periodic [3,7]-tiling with hyperbolic orbifold symbol {\\sf {2223}} and a {\\sf {22222}} surface decoration.
Policy transfer networks
Publisher: Routledge
Date: 05-07-2017
Globalisation and public policy under new labour
Publisher: Informa UK Limited
Date: 03-2004
Understanding integrity in public administration: Guest Editors' Introduction
Publisher: Informa UK Limited
Date: 2012
Public Administration and Public Policy in Ireland
Publisher: Routledge
Date: 02-09-2003
Cameron's competition state
Publisher: Informa UK Limited
Date: 2010
Swelling and Structure. Analysis of the Topology and Geometry of Lamellar and Sponge Lyotropic Mesophases
Publisher: American Chemical Society (ACS)
Date: 02-1997
DOI: 10.1021/LA9605347
The intrinsic group-subgroup structures of the Diamond and Gyroid minimal surfaces in their conventional unit cells
Publisher: International Union of Crystallography (IUCr)
Date: 2022
DOI: 10.1107/S2053273321012936
Abstract: The intrinsic, hyperbolic crystallography of the Diamond and Gyroid minimal surfaces in their conventional unit cells is introduced and analysed. Tables are constructed of symmetry subgroups commensurate with the translational symmetries of the surfaces as well as group–subgroup lattice graphs.
Interest rates hierarchical structure
Publisher: Elsevier BV
Date: 09-2005
Elastic and Morphological Properties of Porous Biomaterials
Publisher: Elsevier BV
Date: 2010
Trust, sense of community, and civic engagement: Lessons from Australia
Publisher: Wiley
Date: 20-08-2019
DOI: 10.1002/JCOP.22119
Abstract: This article examines the association between trust, sense of community, and civic engagement, with a particular focus on the socioeconomic characteristics of in iduals, using data from the Household, Income, and Labor Dynamics in Australia Survey. Through the use of panel logit and binary panel data models, we draw three core observations. First, there is evidence that trust is associated with civic engagement in Australia, particularly in the case of volunteering. Trust is a prerequisite for women to participate in volunteering but not for men, where a sense of community matters more. Second, a high sense of community matters for both types of participation, political and volunteering. Third, the relationships between trust, sense of community, and civic engagement are present among the Baby Boomer and Generation X generations but not the Generation Y generation, which participates differently. The study makes an important contribution to the literature by unmasking the gender and generation stories and debunking popular myths about the unwillingness of new Australians to engage in associative behavior.
Post-war reconstruction, policy transfer and the World Bank: the case of Afghanistan's National Solidarity Programme
Publisher: Informa UK Limited
Date: 11-2012
Targeted Accumulation of Macrophages Induced by Microbeam Irradiation in a Tissue-Dependent Manner.
Publisher: MDPI AG
Date: 22-03-2022
DOI: 10.3390/BIOMEDICINES10040735
Abstract: Radiation therapy (RT) is a vital component of multimodal cancer treatment, and its immunomodulatory effects are a major focus of current therapeutic strategies. Macrophages are some of the first cells recruited to sites of radiation-induced injury where they can aid in tissue repair, propagate radiation-induced fibrogenesis and influence tumour dynamics. Microbeam radiation therapy (MRT) is a unique, spatially fractionated radiation modality that has demonstrated exceptional tumour control and reduction in normal tissue toxicity, including fibrosis. We conducted a morphological analysis of MRT-irradiated normal liver, lung and skin tissues as well as lung and melanoma tumours. MRT induced distinct patterns of DNA damage, reflecting the geometry of the microbeam array. Macrophages infiltrated these regions of peak dose deposition at variable timepoints post-irradiation depending on the tissue type. In normal liver and lung tissue, macrophages clearly demarcated the beam path by 48 h and 7 days post-irradiation, respectively. This was not reflected, however, in normal skin tissue, despite clear DNA damage marking the beam path. Persistent DNA damage was observed in MRT-irradiated lung carcinoma, with an accompanying geometry-specific influx of mixed M1/M2-like macrophage populations. These data indicate the unique potential of MRT as a tool to induce a remarkable accumulation of macrophages in an organ/tissue-specific manner. Further characterization of these macrophage populations is warranted to identify their organ-specific roles in normal tissue sparing and anti-tumour responses.
Microdomain structures with hyperbolic interfaces in block and graft copolymer systems
Publisher: Elsevier BV
Date: 08-1996
From three-dimensional weavings to swollen corneocytes
Publisher: The Royal Society
Date: 11-03-2011
Abstract: A novel technique to generate three-dimensional Euclidean weavings, composed of close-packed, periodic arrays of one-dimensional fibres, is described. Some of these weavings are shown to dilate by simple shape changes of the constituent fibres (such as fibre straightening). The free volume within a chiral cubic ex le of a dilatant weaving, the ideal conformation of the G 129 weaving related to the Σ + rod packing, expands more than fivefold on filament straightening. This remarkable three-dimensional weaving, therefore, allows an unprecedented variation of packing density without loss of structural rigidity and is an attractive design target for materials. We propose that the G 129 weaving (ideal Σ + weaving) is formed by keratin fibres in the outermost layer of mammalian skin, probably templated by a folded membrane.
Experimental investigation of the mechanical stiffness of periodic framework-patterned elastomers
Publisher: The Royal Society
Date: 13-02-2014
Abstract: Recent advances in the cataloguing of three-dimensional nets mean a systematic search for framework structures with specific properties is now feasible. Theoretical arguments about the elastic deformation of frameworks suggest characteristics of mechanically isotropic networks. We explore these concepts on both isotropic and anisotropic networks by manufacturing porous elastomers with three different periodic net geometries. The blocks of patterned elastomers are subjected to a range of mechanical tests to determine the dependence of elastic moduli on geometric and topological parameters. We report results from axial compression experiments, three-dimensional X-ray computed tomography imaging and image-based finite-element simulations of elastic properties of framework-patterned elastomers.
Morphological influence of magnesium and organic additives on the precipitation of calcite
Publisher: Elsevier BV
Date: 10-2001
Use of alternate coreceptors on primary cells by two HIV-1 isolates
Publisher: Elsevier BV
Date: 08-2005
DOI: 10.1016/J.VIROL.2005.05.027
Abstract: Two HIV-1 isolates (CM4 and CM9) able to use alternate HIV-1 coreceptors on transfected cell lines were tested for their sensitivity to inhibitors of HIV-1 entry on primary cells. CM4 was able to use CCR5 and Bob/GPR15 efficiently in transfected cells. The R5 isolate grew in Delta32/Delta32 CCR5 PBMC in the absence or presence of AMD3100, a CXCR4-specific inhibitor, indicating that it uses a receptor other than CCR5 or CXCR4 on primary cells. It was insensitive to the CCR5 entry inhibitors RANTES and PRO140, but was partially inhibited by vMIP-1, a chemokine that binds CCR3, CCR8, GPR15 and CXCR6. The coreceptor used by this isolate on primary cells is currently unknown. CM9 used CCR5, CXCR4, Bob/GPR15, CXCR6, CCR3, and CCR8 on transfected cells and was able to replicate in the absence or presence of AMD3100 in Delta32/Delta32 CCR5 PBMC. It was insensitive to eotaxin, vMIP-1 and I309 when tested in idually, but was inhibited completely when vMIP-1 or I309 was combined with AMD3100. Both I309 and vMIP-1 bind CCR8, strongly suggesting that this isolate can use CCR8 on primary cells. Collectively, these data suggest that some HIV-1 isolates can use alternate coreceptors on primary cells, which may have implications for strategies that aim to block viral entry.
Understanding Localism
Publisher: Informa UK Limited
Date: 07-2013
The New Constitutionalism and the Impact of Spill-Over
Publisher: SAGE Publications
Date: 06-2000
DOI: 10.1177/095207670001500202
Abstract: This article provides a preliminary examination of the political consequences of constitutional reform for the territorial management of the British State. Drawing on European integration theory, it argues that the constitutional reform process can best be examined through the lens of a modified neo ficnctionalist approach which allows the political scientist to: (1) study constitutional reform as a process (2) describe what appears to be going on in the process (3) identify factors of integration and disintegration and, (4), predict future outcomes. It concludes that although the New Constitutionalism is likely to be plagued by factors of disintegration that will undermine territorial management and administration, these will be counterbalanced by factors of integration which will increase the radicalism of reform and the scope and intensity of change.
Exact construction of periodic minimal surfaces : the I-WP surface and its isometries
Publisher: EDP Sciences
Date: 1990
Metastable Interwoven Mesoporous Metal–Organic Frameworks
Publisher: American Chemical Society (ACS)
Date: 25-09-2013
DOI: 10.1021/IC401870E
Abstract: Three isostructural interwoven 3,4-connected mesoporous metal-organic frameworks of pto-a topology (UTSA-28-Cu, UTSA-28-Zn, and UTSA-28-Mn) were synthesized and structurally characterized. Because of their metastable nature, their gas sorption properties are highly dependent on the metal ions and activation profiles. The most stable, UTSA-28a-Cu, exhibits promising gas storage and separation capacities.
The martensite transition and differential geometry
Publisher: Walter de Gruyter GmbH
Date: 1986
Continuous transformations of cubic minimal surfaces
Publisher: Springer Science and Business Media LLC
Date: 1999
Geometry of interfaces: topological complexity in biology and materials INTRODUCTION
Publisher: The Royal Society
Date: 08-08-2012
Self-assembly of carbonate-silica colloids: between living and non-living form
Publisher: Elsevier BV
Date: 08-2004
A cubic structure consisting of a lipid bilayer forming an infinite periodic minimum surface of the gyroid type in the glycerolmonooleat-water system
Publisher: Walter de Gruyter GmbH
Date: 1984
Book Review - Observing Government Elites: Up Close and Personal
Publisher: Wiley
Date: 16-12-2010
The Language of Shape
Publisher: Elsevier
Date: 1997
Beyond the Integrity Paradox - towards 'good enough' governance
Publisher: Informa UK Limited
Date: 2012
Circular dichroism in biological photonic crystals and cubic chiral nets
Publisher: American Physical Society (APS)
Date: 11-03-2011
The tricontinuous 3 ths (5) phase: A new morphology in copolymer melts
Publisher: American Chemical Society (ACS)
Date: 23-10-2014
DOI: 10.1021/MA5016352
Vertex symbols for zeolite nets
Publisher: Elsevier BV
Date: 11-1997
Magnetic Properties of Novel Carbon Allotropes
Publisher: Elsevier
Date: 2006
Parametrization of triply periodic minimal surfaces. I. Mathematical basis of the construction algorithm for the regular class
Publisher: International Union of Crystallography (IUCr)
Date: 07-1992
Policy transfer networks and Collaborative Government
Publisher: SAGE Publications
Date: 04-1999
DOI: 10.1177/095207679901400204
Abstract: This article makes three central claims. Firstly, it argues that the study of policy transfer provides a rich source for investigating structures and processes of Collaborative Government. For policy transfer is the outcome of collaborative activities between governmental and non-governmental actors. Secondly, it further argues that Collaborative Government can both extend and limit participation empower and disempower. Thirdly, we draw on previous work (Evans and Davies, 1999), to contend that the policy transfer network approach provides a useful lens for studying this particular structure and process of Collaborative Government. The article explores these three claims through a case study of the emergence and development of a performance measurement and resource allocation programme within the Department of Social Security to counter social security fraud. The case study draws on the insights of the Project Leader and his team.
A systematic net description of saddle polyhedra and periodic minimal surfaces
Publisher: Walter de Gruyter GmbH
Date: 1984
Differential geometry of a model membrane consisting of a lipid bilayer with a regular array of protein units
Publisher: Walter de Gruyter GmbH
Date: 1986
Minimal surfaces and structures: from inorganic and metal crystals to cell membranes and biopolymers
Publisher: American Chemical Society (ACS)
Date: 1988
DOI: 10.1021/CR00083A011
Parametrization of triply periodic minimal surfaces. II. Regular class solutions
Publisher: International Union of Crystallography (IUCr)
Date: 07-1992
Bicontinuous structures in lyotropic liquid crystals and crystalline hyperbolic surfaces
Publisher: Elsevier BV
Date: 10-1996
Periodic entanglement III: tangled degree-3 finite and layer net intergrowths from rare forests
Publisher: International Union of Crystallography (IUCr)
Date: 20-10-2015
DOI: 10.1107/S2053273315014710
Abstract: Entanglements of two-dimensional honeycomb nets are constructed from free tilings of the hyperbolic plane ({\\bb H}^2) on triply periodic minimal surfaces. The 2-periodic nets that comprise the structures are guaranteed by considering regular, rare free tilings in {\\bb H}^2. This paper catalogues an array of entanglements that are both beautiful and challenging for current classification techniques, including ex les that are realized in metal–organic materials. The compactification of these structures to the genus-3 torus is considered as a preliminary method for generating entanglements of finite θ-graphs, potentially useful for gaining insight into the entanglement of the periodic structure. This work builds on previous structural enumerations given in Periodic entanglement Parts I and II [Evans et al. (2013). Acta Cryst. A 69 , 241–261 Evans et al. (2013). Acta Cryst. A 69 , 262–275].
Local v/a variations as a measure of structural packing frustration in bicontinuous mesophases, and geometric arguments for an alternating Im3̄m (I-WP) phase in block-copolymers with polydispersity
Publisher: Springer Science and Business Media LLC
Date: 09-2007
A topological characterisation of chemical structures
Publisher: Walter de Gruyter GmbH
Date: 1987
Karzai's curse - legitimacy as stability in Afghanistan and other post-conflict environments
Publisher: Informa UK Limited
Date: 09-2012
Neoliberalism and Policy Transfer in the British Competition State
Publisher: Palgrave Macmillan UK
Date: 2005
Microstructure from X-ray scattering: The disordered open connected model of microemulsions
Publisher: American Chemical Society (ACS)
Date: 07-1987
DOI: 10.1021/J100298A018
A Short History of an Elusive Yet Ubiquitous Structure in Chemistry, Materials, and Mathematics
Publisher: Wiley
Date: 29-09-2008
Ideal geometry of periodic entanglements
Publisher: The Royal Society
Date: 09-2015
Abstract: Three-dimensional entanglements, including knots, knotted graphs, periodic arrays of woven filaments and interpenetrating nets, form an integral part of structure analysis because they influence various physical properties. Ideal embeddings of these entanglements give insight into identification and classification of the geometry and physically relevant configurations in vivo . This paper introduces an algorithm for the tightening of finite, periodic and branched entanglements to a least energy form. Our algorithm draws inspiration from the Shrink-On-No-Overlaps (SONO) (Pieranski 1998 In Ideal knots (eds A Stasiak, V Katritch, LH Kauffman), vol. 19, pp. 20–41.) algorithm for the tightening of knots and links: we call it Periodic-Branched Shrink-On-No-Overlaps (PB-SONO). We reproduce published results for ideal configurations of knots using PB-SONO. We then examine ideal geometry for finite entangled graphs, including θ -graphs and entangled tetrahedron- and cube-graphs. Finally, we compute ideal conformations of periodic weavings and entangled nets. The resulting ideal geometry is intriguing: we see spontaneous symmetrisation in some cases, breaking of symmetry in others, as well as configurations reminiscent of biological and chemical structures in nature.
Inorganic Self-Organized Silica Aragonite Biomorphic Composites
Publisher: American Chemical Society (ACS)
Date: 16-04-2008
DOI: 10.1021/CG700692T
A construction algorithm for minimal surfaces
Publisher: EDP Sciences
Date: 1987
Apology from the Editor
Publisher: Informa UK Limited
Date: 2013
Embedding Neo-liberalism Through Statecraft: the Case of Market Reform in Vietnam
Publisher: Palgrave Macmillan UK
Date: 2005
Tangled (up in) cubes
Publisher: International Union of Crystallography (IUCr)
Date: 15-02-2007
On the Structure of Native Starch — An Analogue to the Quartz Structure
Publisher: Wiley
Date: 1987
On the periodic minimal surfaces and the conductivity mechanism of α-AgI
Publisher: Walter de Gruyter GmbH
Date: 1985
Deconstruction of Crystalline Networks into Underlying Nets: Relevance for Terminology Guidelines and Crystallographic Databases
Publisher: American Chemical Society (ACS)
Date: 07-05-2018
Measurements of Interfacial Curvatures of Bicontinuous Structure from Three-Dimensional Digital Images. 1. A Parallel Surface Method
Publisher: American Chemical Society (ACS)
Date: 23-01-1998
DOI: 10.1021/LA970868B
Novel surfactant mesostructural topologies: Between lamellae and columnar (hexagonal) forms
Publisher: Elsevier BV
Date: 03-2003
A rhombohedral family of minimal surfaces as a pathway between the P and D cubic mesophases
Publisher: Elsevier BV
Date: 08-2004
Minimal surfaces and fast-ion conductors
Publisher: Informa UK Limited
Date: 06-1988
Symmetry groups and reticulations of the hexagonal H surface
Publisher: Elsevier BV
Date: 08-2004
Polycontinuous morphologies and interwoven helical networks
Publisher: IOP Publishing
Date: 15-04-2000
On the Swelling of Amphiphiles in Water
Publisher: American Chemical Society (ACS)
Date: 1996
DOI: 10.1021/LA960794O
Some novel three-dimensional Euclidean crystalline networks derived from two-dimensional hyperbolic tilings
Publisher: Springer Science and Business Media LLC
Date: 2003
Curvature Determination of Spinodal Interface in a Condensed Matter System
Publisher: American Physical Society (APS)
Date: 17-03-1997
Crafting Public policy
Publisher: Policy Press
Date: 29-09-2016
DOI: 10.1332/POLICYPRESS/9781447329367.003.0003
Abstract: This chapter aims to give a realistic account of how to select a method and so provide the reader with a guiding introduction to the methods that follow. It argues that the choice of method to aid policymaking will reflect a range of factors. For ex le, the breadth and range of evidence that is already available, or the need to gain insights from hard to reach citizens.
Schwarzite nets: a wealth of 3-valent examples sharing similar topologies and symmetries
Publisher: The Royal Society
Date: 02-2021
Abstract: We enumerate trivalent reticulations of two- and three-periodic hyperbolic surfaces by equal-sided n -gonal faces, ( n , 3), where n = 7, 8, 9, 10, 12. These are the simplest hyperbolic generalizations of the planar graphene net, (6, 3) and dodecahedrane, (5, 3). The enumeration proceeds by deleting isometries of regular reticulations of two-dimensional hyperbolic space until the ( n , 3) nets can be embedded in euclidean three-space via periodic hyperbolic surfaces. Those nets are then symmetrized in euclidean space retaining their net topology, leading to explicit crystallographic net embeddings whose edges are as equal as possible, affording candidtae patterns for graphitic schwarzites. The resulting schwarzites are the most symmetric ex les. More than one hundred topologically distinct nets are described, most of which are novel.
Bending energy of surfactant films
Publisher: Royal Society of Chemistry (RSC)
Date: 1991
DOI: 10.1039/FT9918700949
The topology and geometry of infinite periodic surfaces
Publisher: Walter de Gruyter GmbH
Date: 1989
On swelling and structure of composite materials. Some theory and applications of lyotropic mesophases
Publisher: Elsevier BV
Date: 10-1995
Beyond amphiphiles: coarse-grained simulations of star-polyphile liquid crystalline assemblies
Publisher: Royal Society of Chemistry (RSC)
Date: 2009
DOI: 10.1039/B818032F
Abstract: We have simulated the self-assembly of a novel class of three-arm molecules, ABC star-architecture polyphiles, using coarse-grained bead simulations. A number of topologically complex liquid crystalline mesostructures arise that can be related to the better-known bicontinuous mesophases of lyotropic hiphilic systems. The simulations reveal 3D self-assemblies whose structural variations follow those expected assuming a simple steric molecular packing model as a function of star polyphile splay and relative volumes of each arm in the polyphile. The splay of each arm, characterised by the 3D wedge-shape emanating from the core of each molecule to its exterior induces torsion of the interfaces along the triple lines, whereas differences in the relative volumes of arms induce curvature of the triple lines. Three distinct mesostructures are described, characterised by their micro-domain topologies, which are unknown in simpler hiphilic systems, but resemble in some respects bicontinuous mesophases. These three- (or more) arm polyphilic systems offer an interesting extension to the better-known self-assembly of (two-arm) hiphiles in solution.
In conclusion - policy transfer in global perspective
Publisher: Routledge
Date: 05-07-2017
Minimal surface scaffold designs for tissue engineering
Publisher: Elsevier BV
Date: 10-2011
DOI: 10.1016/J.BIOMATERIALS.2011.06.012
Abstract: Triply-periodic minimal surfaces are shown to be a more versatile source of biomorphic scaffold designs than currently reported in the tissue engineering literature. A scaffold architecture with sheetlike morphology based on minimal surfaces is discussed, with significant structural and mechanical advantages over conventional designs. These sheet solids are porous solids obtained by inflation of cubic minimal surfaces to sheets of finite thickness, as opposed to the conventional network solids where the minimal surface forms the solid/void interface. Using a finite-element approach, the mechanical stiffness of sheet solids is shown to exceed that of conventional network solids for a wide range of volume fractions and material parameters. We further discuss structure-property relationships for mechanical properties useful for custom-designed fabrication by rapid prototyping. Transport properties of the scaffolds are analyzed using Lattice-Boltzmann computations of the fluid permeability. The large number of different minimal surfaces, each of which can be realized as sheet or network solids and at different volume fractions, provides design flexibility essential for the optimization of competing design targets.
Periodic entanglement I: networks from hyperbolic reticulations
Publisher: International Union of Crystallography (IUCr)
Date: 28-03-2013
The Art of Prescription - Theory and Practice in Public Administration Research
Publisher: SAGE Publications
Date: 2007
Abstract: This article addresses a perennial controversy in the study of public administration - should academic knowledge about public administration be used for its betterment? And, if so, how should academic knowledge about public administration be used for its betterment? It is claimed that the answers to these questions lie in the symbiotic relationship between knowledge and action, theory and practice. In consequence it is argued that it is the responsibility of public administration scholars not only to provide explanations and understandings of administrative and political subjects but also to defend bureaucracy and to seek progress through ‘enlightened’ prescription. With these arguments in mind, first a ‘critical approach’ to public administration for reconciling the world of thought and the world of action is presented in which the prescriptive enterprise is used to integrate theory and practice. Second, a set of principles for ‘enlightened’ prescription is formulated to ensure that the knowledge claims that emerge from this process remain as rigorously conceived as possible. And third, a methodology is developed through the use of a logical framework matrix to provide both a practical device for evaluating the utility of public administration research for public action and to draw attention to putative problems in research in terms of theorization, method, data analysis and synthesis - thus demonstrating the benefit of ‘enlightened’ prescription to both the study of public administration and its practice.
Europe, Goldsmith and the Referendum Party
Publisher: Oxford University Press (OUP)
Date: 07-1998
Ravels: knot-free but not free. Novel entanglements of graphs in 3-space
Publisher: Royal Society of Chemistry (RSC)
Date: 2008
DOI: 10.1039/B719665B
Hyperbolic and elliptic layer warping in some sheet alumino-silicates
Publisher: Springer Science and Business Media LLC
Date: 08-1993
DOI: 10.1007/BF00200121
Phase boundaries for ternary microemulsions. Predictions of a geometric model
Publisher: American Chemical Society (ACS)
Date: 02-1989
DOI: 10.1021/J100341A056
Microstructure of bicontinuous surfactant aggregates
Publisher: American Chemical Society (ACS)
Date: 02-1989
DOI: 10.1021/J100341A055
From 2D hyperbolic forests to 3D Euclidean entangled thickets
Publisher: Springer Science and Business Media LLC
Date: 08-2000
DOI: 10.1007/PL00011063
Full length article
Publisher: Elsevier BV
Date: 12-1998
Gordon Brown and public management reform - a project in search of a 'big idea'?
Publisher: Informa UK Limited
Date: 02-2009
Medial surfaces of hyperbolic structures
Publisher: Springer Science and Business Media LLC
Date: 10-2003
Three-dimensional Euclidean nets from two-dimensional hyperbolic tilings: Kaleidoscopic examples
Publisher: International Union of Crystallography (IUCr)
Date: 28-01-2009
The chiral structure of porous chitin within the wing-scales of Callophrys rubi
Publisher: Elsevier BV
Date: 05-2011
DOI: 10.1016/J.JSB.2011.01.004
Abstract: The structure of the porous three-dimensional reticulated pattern in the wing scales of the butterfly Callophrys rubi (the Green Hairstreak) is explored in detail, via scanning and transmission electron microscopy. A full 3D tomographic reconstruction of a section of this material reveals that the predominantly chitin material is assembled in the wing scale to form a structure whose geometry bears a remarkable correspondence to the srs net, well-known in solid state chemistry and soft materials science. The porous solid is bounded to an excellent approximation by a parallel surface to the Gyroid, a three-periodic minimal surface with cubic crystallographic symmetry I4₁32, as foreshadowed by Stavenga and Michielson. The scale of the structure is commensurate with the wavelength of visible light, with an edge of the conventional cubic unit cell of the parallel-Gyroid of approximately 310 nm. The genesis of this structure is discussed, and we suggest it affords a remarkable ex le of templating of a chiral material via soft matter, analogous to the formation of mesoporous silica via surfactant assemblies in solution. In the butterfly, the templating is achieved by the lipid-protein membranes within the smooth endoplasmic reticulum (while it remains in the chrysalis), that likely form cubic membranes, folded according to the form of the Gyroid. The subsequent formation of the chiral hard chitin framework is suggested to be driven by the gradual polymerisation of the chitin precursors, whose inherent chiral assembly in solution (during growth) promotes the formation of a single enantiomer.
Does political trust matter?
Publisher: Edward Elgar Publishing
Date: 05-12-2019
Australian administrative elites and the challenges of digital-era change
Publisher: Informa UK Limited
Date: 03-04-2019
Solid-State Structures and Liquid Crystals as Ordering Matrices for Proteins.
Publisher: Danish Chemical Society
Date: 1994
Unification and classification of two-dimensional crystalline patterns using orbifolds
Publisher: International Union of Crystallography (IUCr)
Date: 28-05-2014
DOI: 10.1107/S205327331400549X
Abstract: The concept of an orbifold is particularly suited to classification and enumeration of crystalline groups in the euclidean (flat) plane and its elliptic and hyperbolic counterparts. Using Conway's orbifold naming scheme, this article explicates conventional point, frieze and plane groups, and describes the advantages of the orbifold approach, which relies on simple rules for calculating the orbifold topology. The article proposes a simple taxonomy of orbifolds into seven classes, distinguished by their underlying topological connectedness, boundedness and orientability. Simpler `crystallographic hyperbolic groups' are listed, namely groups that result from hyperbolic sponge-like sections through three-dimensional euclidean space related to all known genus-three triply periodic minimal surfaces ( i.e. the P , D , Gyroid , CLP and H surfaces) as well as the genus-four I-WP surface.
Observation of Two Phases within the Cubic Phase Region of a Ternary Surfactant Solution
Publisher: American Chemical Society (ACS)
Date: 06-1990
DOI: 10.1021/LA00096A019
Symmetric Tangling of Honeycomb Networks
Publisher: MDPI AG
Date: 31-08-2022
DOI: 10.3390/SYM14091805
Abstract: Symmetric, elegantly entangled structures are a curious mathematical construction that has found their way into the heart of the chemistry lab and the toolbox of constructive geometry. Of particular interest are those structures—knots, links and weavings—which are composed locally of simple twisted strands and are globally symmetric. This paper considers the symmetric tangling of multiple 2-periodic honeycomb networks. We do this using a constructive methodology borrowing elements of graph theory, low-dimensional topology and geometry. The result is a wide-ranging enumeration of symmetric tangled honeycomb networks, providing a foundation for their exploration in both the chemistry lab and the geometers toolbox.
At sixes and sevens, and eights, and nines: schwarzites p 3, p = 7, 8, 9
Publisher: Springer Science and Business Media LLC
Date: 11-06-2016
Bruce Godfrey Hyde 1925-2014
Publisher: CSIRO Publishing
Date: 2015
DOI: 10.1071/HR15006
Abstract: Bruce Hyde made seminal contributions to modern solid state chemistry, in particular to the understanding and characterization of non-stoichiometry and structural complexity in the solid state. His work showed unequivocally that non-stoichiometric crystalline materialswere often much more highly ordered than previously believed, that the ‘point defects' of conventional wisdom were in fact ordered into extended defects and that these defects were themselves ordered into structures of complexities hitherto unimagined. His deep understanding of crystal chemistry and structural relationships is apparent in his two co-authored books with his closest colleagues, Sten Andersson and Michael O'Keeffe. It also led to his mentoring an entire generation of younger Australian (and international) solid state chemists.
Interwoven Metal-Organic Framework on a Periodic Minimal Surface with Extra-Large Pores
Publisher: American Association for the Advancement of Science (AAAS)
Date: 09-02-2001
Abstract: Interpenetration (catenation) has long been considered a major impediment in the achievement of stable and porous crystalline structures. A strategy for the design of highly porous and structurally stable networks makes use of metal-organic building blocks that can be assembled on a triply periodic P -minimal geometric surface to produce structures that are interpenetrating—more accurately considered as interwoven. We used 4,4′,4"-benzene-1,3,5-triyl-tribenzoic acid (H 3 BTB), copper(II) nitrate, and N , N ′-dimethylformamide (DMF) to prepare Cu 3 (BTB) 2 (H 2 O) 3 ·(DMF) 9 (H 2 O) 2 (MOF-14), whose structure reveals a pair of interwoven metal-organic frameworks that are mutually reinforced. The structure contains remarkably large pores, 16.4 angstroms in diameter, in which voluminous amounts of gases and organic solvents can be reversibly sorbed.
Co-precipitation of silica and alkaline-earth carbonates using TEOS as silica source
Publisher: Elsevier BV
Date: 08-2007
A Theoretical Schema for Building Weavings of Nets via Colored Tilings of Two‐Dimensional Spaces and Some Simple Polyhedral, Planar and Three‐Periodic Examples
Publisher: Wiley
Date: 10-2018
Symmetric tangled Platonic polyhedra
Publisher: Proceedings of the National Academy of Sciences
Date: 04-01-2022
Abstract: Tangled tetrahedra, octahedra, cubes, icosahedra, and dodecahedra are generalizations of classical—untangled—Platonic polyhedra. Like the Platonic polyhedra, all vertices, edges, and faces are symmetrically equivalent. However, the edges of tangled polyhedra are curvilinear, or kinked, to allow entanglement, much like warps and wefts in woven fabrics. We construct the most symmetric entanglements of these polyhedra via assemblies of multistrand helices wound around edges of the conventional polyhedra they are all necessarily chiral. The construction gives self-entangled chiral polyhedra and compound polyhedra containing catenated multiple tetrahedra or “generalized θ -polyhedra.” An unlimited variety of tangling is possible for any given topology. Related structures have been observed in synthetic materials and clathrin assemblies within cells.
International Policy Transfer: Between the Global and Sovereign and between the Global and Local
Publisher: Oxford University Press
Date: 17-01-2019
DOI: 10.1093/OXFORDHB/9780198758648.013.3
Abstract: The policy transfer literature has evolved from its nation state, bureaucracy-centred origins to encompass a broad range of governance institutions and actors operating at difference levels of governance and sectors, from the local to the global. This chapter evaluates the implications of this change in scope for both the study and the practice of policy transfer and provides an understanding of the relationship between systemic globalizing forces and the increasing scope and intensity of policy transfer activity. Its contribution is threefold. it provides: (1) an explanation of policy transfer as a process of organizational learning (2) an insight into how and why such processes are studied by policy scientists from different disciplinary perspectives and (3), an evaluation of its use by policy practitioners. It concludes by arguing that the limits of policy transfer analysis can be addressed through democratizing policy transfer practice through ‘action learning’, ‘co-design’, and ‘experimentation’.
Bicontinuous geometries and molecular self-assembly: Comparison of local curvature and global packing variations in genus-three cubic, tetragonal and rhombohedral surfaces
Publisher: Springer Science and Business Media LLC
Date: 12-2006
Observation of mesh and strut structures in block copolymer/homopolymer mixtures
Publisher: American Chemical Society (ACS)
Date: 03-1992
DOI: 10.1021/MA00031A012
Curvature Energy of Surfactant Interfaces Confined to the Plaquettes of a Cubic Lattice
Publisher: American Chemical Society (ACS)
Date: 06-1990
DOI: 10.1021/LA00096A005
Crystal structures as periodic graphs: the topological genome and graph databases
Publisher: Springer Science and Business Media LLC
Date: 23-09-2016
The mechanisms of the formation and growth of water bubbles and associated dislocation loops in synthetic quartz
Publisher: Springer Science and Business Media LLC
Date: 02-1983
DOI: 10.1007/BF00308151
Towards digital era governance
Publisher: Edward Elgar Publishing
Date: 29-03-2019
Understanding water governance
Publisher: Informa UK Limited
Date: 10-08-2017
Adsorption in zeolites, dispersion self-energy, and Gaussian curvature
Publisher: American Chemical Society (ACS)
Date: 1993
DOI: 10.1021/J100105A021
Periodic entanglement II: weavings from hyperbolic line patterns
Publisher: International Union of Crystallography (IUCr)
Date: 28-03-2013
Strong paramagnetism and possible ferromagnetism in pure carbon nanofoam produced by laser ablation
Publisher: Elsevier BV
Date: 04-2005
A novel lyotropic liquid crystal formed by triphilic star-polyphiles: hydrophilic/oleophilic/fluorophilic rods arranged in a 12.6.4. tiling
Publisher: Royal Society of Chemistry (RSC)
Date: 2011
DOI: 10.1039/C0CP01201G
Abstract: Triphilic star-polyphiles are short-chain oligomeric molecules with a radial arrangement of hydrophilic, hydrocarbon and fluorocarbon chains linked to a common centre. They form a number of liquid crystalline structures when mixed with water. In this contribution we focus on a hexagonal liquid crystalline mesophase found in star-polyphiles as compared to the corresponding double-chain surfactant to determine whether the hydrocarbon and fluorocarbon chains are in fact demixed in these star-polyphile systems, or whether both hydrocarbon and fluorocarbon chains are miscible, leading to a single hydrophobic domain, making the star-polyphile effectively hiphilic. We report SANS contrast variation data that are compatible only with the presence of three distinct immiscible domains within this hexagonal mesophase, confirming that these star-polyphile liquid crystals are indeed hydrophilic/oleophilic/fluorophilic 3-phase systems. Quantitative comparison with scattering simulations shows that the experimental data are in very good agreement with an underlying 2D columnar (12.6.4) tiling. As in a conventional hiphilic hexagonal mesophase, the hexagonally packed water channels (dodecagonal prismatic domains) are embedded in a hydrophobic matrix, but that matrix is split into oleophilic hexagonal prismatic domains and fluorophilic quadrangular prismatic domains.
On the templating of curvature in zeolites
Publisher: American Chemical Society (ACS)
Date: 05-1990
DOI: 10.1021/CM00009A023
Recent pathotype development of New Zealand cereal rust populations
Publisher: New Zealand Plant Protection Society
Date: 02-07-2018
DOI: 10.30843/NZPP.2018.71.156
Abstract: Rust diseases are serious threats to New Zealand cereal crops. Beside the use of fungicides, resistant varieties are an important option for managing these diseases. Changes in rust pathotypes commonly occur due to mutations in existing populations or exotic incursions. Information on these changes is the basis of gene-based disease management. Rust-infected leaves were collected from cereal crops from 2012 to 2015. The pathotypes of these and some historic s les were determined in glasshouse studies, using specific differential host sets. Eight pathotypes of Puccinia triticina (Pt, causal agent of wheat leaf rust), five of P. striiformis f. sp. tritici (Pst, causal agent of wheat stripe rust) and two of P. hordei (Ph, causal agent of barley leaf rust) were identified. The Pst ‘WA’ pathotype was most frequently found. Wheat varieties ‘Empress’ and ‘Torch’, previously resistant to Pt, were found to be susceptible to leaf rust for the first time. The ‘WA’ pathotype of Pst is likely to have arrived in New Zealand from Australia, and is now widespread. The two Pt pathotypes could have overcome resistance gene Lr24 in ‘Empress’ and ‘Torch’.
Electronic and magnetic properties of carbon nanofoam produced by high-repetition-rate laser ablation
Publisher: Elsevier BV
Date: 09-2002
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Funder: Australian Research Council
View Funded ActivityDiscovery Projects - Grant ID: DP0666365
Start Date: 04-2006
End Date: 12-2009
Amount: $400,000.00
Funder: Australian Research Council
View Funded Activity